SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ede665dbd5ce82f806a97d86417539b08193195b0e33fda3b55b062dd586409' 
  AND token = 'WJbnwsfpLfzE7lH01YLQOWObBKjgpWWoq+viCet8EDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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