SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c228a832fc5b78ed54a4873f643ff1ff88e4d59e1e3fbd94f9f43425235b1e8' 
  AND token = 'ZuNDzorP7dnhXwiM+7Gd3wHgVzh/BTa/QO1j4+ElKrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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