SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01777852db26c318bff380873c45b19ba313beba352f79c89b694f1cef193acc' 
  AND token = 'OJv5+E25fz61LbGkzkXiYoMBG4uZRE/KoxfHnHmXGs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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