Is there any aircraft that cruises in the transonic regime?
If we define the critical Mach number as "the lowest Mach number at which the airflow over some point of the aircraft reaches the speed of sound, but does not exceed it," then yes, many aircraft cruise above this speed. Any modern jet airliner has some supersonic flow over parts of the wing and fuselage at cruise, placing it squarely in the transonic range. This video and its description provide a great visualization and explanation of the associated phenomena.

It should be noted, however, that there is not necessarily a large increase in drag upon reaching the critical Mach number. More useful in the transonic range is the drag-divergence Mach number, which is always greater than the critical Mach number. Supercritical airfoils are designed specifically to increase the drag-divergence Mach number, and are fitted to all modern jetliners.