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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa241f066ff323e9c1427feb8ae62b0f95f8c91fc266909d58f99479526c630' 
  AND token = 'Uw0TPzb4S9LT1afyMnWBWicx646nZV6n8HAJuvSKZgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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