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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07a17fd0df24614764d5d9b6f98942121c3de71ec8e69bd3cd5220912d341ce' 
  AND token = 'f5hg7iyMbHxATR3vEshYshUGGQ1v72ZJa1D7yEEZk7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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