Cryogenic electro-optic modulators have promising applications in cryogenic optical interconnect for superconducting computing systems. Lithium niobate Mach-Zehnder modulators benefit from the large Pockels coefficient of lithium niobate and, when combined with superconducting traveling-wave electrodes, have the potential to achieve low half-wave voltage and high-speed data transmission. In this paper, a high-performance and scalable bent superconducting traveling-wave electrode is designed and fabricated with asymmetric coplanar waveguide (ACPW) transmission line. By introducing unequal ground gaps on the two sides of the signal line, the proposed ACPW structure concentrates the electric field toward the narrower-gap side, resulting in an approximate 90% enhancement of the central electric field intensity compared to conventional symmetric design, which is expected to improve modulation efficiency. Within a limited chip area, a circular bent transmission-line geometry is implemented. SU-8 photoresist dielectric bridges are employed to suppress discontinuities and parasitic mode conversion in the bent regions, improving high-frequency signal integrity significantly. The high-frequency performance of the fabricated ACPW is characterized at cryogenic temperature in a cryogenic probe station. Measurement results show that the dielectric bridges suppress parasitic resonances induced by impedance discontinuities in the bent regions effectively, improving the 3 dB electrical bandwidth from 9 GHz to 59 GHz at 4.2 K. The dielectric-bridge fabrication process demonstrated in this work is applicable to other superconducting device platform