SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d1922d2f2f0314602b2c4713068ac181de44bdcac665afde3ff9f107aba595' 
  AND token = 'iYdBhR+XIKST3tCX67TAmbYQ58Rcb8oq7RbgGvdCfMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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