SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32198f58f492715234627845bd93ea55ae9cf4c569787a6bfb891d2bcafc885' 
  AND token = 'xkHnbei7TSgd/VI2GUIYqKjIqOHYe2aZJBU7FUaW5wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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