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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25bd91df84113277f7aa1b5290228f38717f6e17e79aa1d8256d197a0b551803' 
  AND token = 'BjriAQhRPWaSQnFsyuYBpOXLKxTiCzMgorluxQFMu6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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