SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f790dd86f707a6481e86f5901e2c1bd65a3c84194084d9e92b2c928e35aa4d2b' 
  AND token = 'wDxaBJl5WeZ+TXB7RC/M2YLTIb+7s9H+XZbdPFlzlOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}