SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf00833859ba9c7f8b371cbc2b2ba753c66cf9f03b4a5e34ed161090561cb13' 
  AND token = '7lJXQAFI/IuODgHVKvVYxxvvdsIxC6F84KMI6v//Bxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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