SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d07f8a76dd14c34744c2df0aa8852fa62227e7b2266b9d65fc7ffda57447c47' 
  AND token = 'in0jGXMQN7DPBgjzxfgwxwDGoJbKHdpfJxVvvb3wTGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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