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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6b28c4fabad97a97a2aa91de5db64a6bd656e8dfe58e5bed543ad86d33cfde' 
  AND token = 'RJlWYoFLH2YPSa3thleGzI4bned48lfXeI7ZSMAqJbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables