SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef49f69809bae76c59c6de388bad533de761ebfcd56d720bbfa299be2ef736b' 
  AND token = 'WUlLiRuQMl/n2LVhyhK8BLsKUwZxdu1ECG7uE/QSnJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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