SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e336bbe5ddebe63e91866fb16dd5bfb7d131a6996d6a9317628d25319da8ad7' 
  AND token = 'gWaA4TwUiAaPBunhzlDILDg/lEHGMvqYOZ9bIc40KCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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