SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1fd529a5ba57bde88aaa666bef6e5c93a1c9e66b2c110b2769b2743becd86d' 
  AND token = 'hqK2nTCuJpXX9dlGTSQHXvbPDTGrxDP7UuxBgYXvhhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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