SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd1b5cd67c1ff68e5901b4410bb26d914096d34669f596f35f3c0418c7ab2e4' 
  AND token = 'hekT9m3Lp3CmxXuVZEyQn3KratZhMHXxpFhjW+vWvKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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