SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e23d02418fb63ce151ab5a05acb9c92dbcf67ed7de2e3207f134c728c9e9060' 
  AND token = '/ezUTVsNbuIX/EXRBPjczVGhXQDKZSnJQTmULO9Qo6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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