Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa01441cdf8da561aa16a8efd9f92c818b36bd96facb3258f20d32d55a68b314' 
  AND token = 'iFXpZpQ0i1sruDCQQJfFnFQkzDqDXJ0dQAINM1wzUGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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