SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '622ce8fee8d797cd0bd66f2ff30c641f3ed3a590b42f36e45f99ee34d4a6e3df' 
  AND token = 'Rx+uk9Iqgl7m12kK5DpZUAll6gYPZpHrpjhEU+Q1Knw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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