SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4354a5ee09fe93280780d9662f065e6f020764b7c03b69fed7f0691629388abb' 
  AND token = 'jH8Rn32cVpAoH5fSxmY5qXUaadwVzhBKq11GP8Ogs7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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