SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1691ce05b5723ef980d460c6f31fe1a7074781b2a78f52d9b3497df26646d7' 
  AND token = 'bdcXl6KaXsVJAO3ZKvUFfCMngipo8eiXQik2PyhGYsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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