SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585081e696c54d0f704bc22f534a2dea7935b4bd1496dc63ed0e10ae2a3d5fe8' 
  AND token = 'bm+XkCbqX/YhdqphR0UipoQQHqv0wnGy2FgaxpurZLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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