SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed0edd07f3fab8cb319705dc0bbbfcc1d5f7b963e6299fb83a5f46a8e0b3115' 
  AND token = 'w5+ukzQ0LzXaEY5mAvwFevgz8sxu89ZIj7zJpOthLjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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