SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daeb8f551c965fb5082027993855c71edda8e4c5ea00f7ff7ca271da3bbb86c' 
  AND token = 'wxon6QFBgEimkngurjz5ZzaKcmqJvziugNT+QkwyIlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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