SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7f86abce0368fabc722acc6c8ea41d74a9eda096ea70f3ab2702520670f3fe' 
  AND token = 'V3Hzs05PisZKTkQZwDDvMSgfKVhq4GBRk+VwuYlHRag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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