SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc6676502480aaacd94e89cd14754e96056757fb0a91fbf9bf9720a5a42c3f4' 
  AND token = '8QqqVxHHJw33aFw0hSJYWUPWAaP+oT0zRmjjiOXwEDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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