SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa5c16c3d2f40e20934ba758543ede109c8d1a8f6412e732a923673ff5ee774' 
  AND token = '9C6nKYvB4vgYIBTgYWmNweVgHV6Qy+ysoGKEPFalrlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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