SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec34fc621c50e8b8a64831e491cb131736814bcdaf188b03c297e08ea152c7b' 
  AND token = 'OgvQ2RzxD+KK5H9DvCletXJQZ+YqI7SZuDlmJrvXYkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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