SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4970a0f2f002fb745ae66d5887c3a51f4e7694b411fbaf819f0bb95caa4219f' 
  AND token = 'Jo2TICm+H/ACdUSFcPLqEwosXKln+jO2ug/oVlAskWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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