SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e416629e95ccadd52e0f1b453bd67d21f4b708309952dc7cc585a301ea7baa' 
  AND token = 'NFzW0wam/luGFQB9nvdRV25zPIEdLg9hEOfSy++CFIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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