SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002ae459ebfb801e9f2e47e6d91ed17a2efcbbbdf279d462722cf53e4f6b3fd0' 
  AND token = '6FeAds0EXIZPvJSazE9dFH2r93iS2Q77DrJlYCvTEi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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