SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd548bff53f5d92cb53f4b612f83ebe7275223fd73280ff58a70161e1bfcd5f' 
  AND token = 'K1iGmQXIFyxlg0hVf9zjxUZBWb+I8S1HUGKpoPvLQpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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