SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a032740aec37d62b4517e04e94613fe17cd8f62c84bb23d389bb1de8a25610f' 
  AND token = 'YePsYAuZlTuYBRhVOCOrpAVbG/WfKKSj24ue6CEnmJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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