SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ff227c264d398be63febf940c14e6751ae314a1d0f29a7dd7eac45236ca3e2' 
  AND token = '9T/alU6Cgiss/1gBleJxr6iXqsLRP2Tflg7ATq6AUH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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