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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faab8ce84782dcd7c92624976b6b493653d58058755e3a0e415de87143d82c81' 
  AND token = '7DXTXLwgp6Re8Hbfx90D6V8WHWv7tfYKpJHgO7qSydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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