SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f183ac7ddf5f6d55bc986aa614ab8e023d4dbf291ed8ee5958efbfa3d9469e44' 
  AND token = '0PCparkPr6IyplShEgdyfSQ+CqUoq4qtiab9gKDEuPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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