SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4603fba81db2e9c816b9a6f1dfb1e2f339084c27e7f435afd77e9aa65fca31b' 
  AND token = 'XUK6s/9hAXPObuJRUtkWG1/RQ/xdHvpLGPrpA4+xIjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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