SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13455e0872f5a2a2ebf3b54f7f174fba9a99881b6ad88692e062111e8b2cad31' 
  AND token = '4vesKlqZRkplNxOkZB5YpE9WOlSGyWCoqpvKP1Ljfwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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