SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef9ae57ed73455e8c73a0feb46c5282b63d771c932168114c6ab7a7dfff1228' 
  AND token = 'Cp+HqAVRIUbmi0nUjd+MWDRzU7CZfXCqQIQAJYerWew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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