SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11f99ec3695fa51a37dd2d050ff9f51c8c5e6a016d9ce5027744ee1e33a0bb4' 
  AND token = 'mixYjbuB+J5Ogw/bO0WqOMb0kFgrrAaYrRWk2PupzL0=' 
  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