SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c665be963efda4070563850cca613a92220d643fe28de88d58c282d226e99dc' 
  AND token = 'TPrr93DrHHsrO0rPyKfJ5mt3HzNnkU/GaGqab1b6I2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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