SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1514349d6073be7373c5092661cc4f6f83fdd2ecc85118125a972408ece9168' 
  AND token = 'lo+izE8Ygsp6tqVjVwvoJqKHDaJmYa6UekkYi2oRd6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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