SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36076e40736f1579bf8588dacf274f48808941c27e2f1c5692f72f35f11cab05' 
  AND token = 'RUVESsfVxgUudUlSdq1T+jdO/n12HpPR6KhtYjsgLxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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