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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a9f5caee7a0b8872c0e5859cd9b8e2b8d6e908f11f9133ef37412a8fe8806a' 
  AND token = '4X4uhZaPAQoXEpRgPUw8fuAVhgRdG0MrgOOPvOuzt0Q=' 
  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