SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18885333b7cff2d8726e5c49ce1b92698e66ee4df0b5a237f3f57afc5381374b' 
  AND token = '4FzWX2zBR6RozRHXdE7ZUYLJuunfdrXFbh88F5+KKwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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