SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d070282330faaf01ed248c62994c1fb1de9147c4e29b3bcf765a198ff0adee6' 
  AND token = 'vn6aFhpQeyWdpGc4/zrD0mC0rxE9Uwkg/J+wjLaH/YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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