SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701013567ddbe8b705bd507f8e01f3d58cc1c3d8779f14bc4d3377463f6efa3f' 
  AND token = 'oVRxHO+bBtr+UrXRH0bKT+8C04c6sdtgrfrLqXdt6uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables