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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab268e7afe33694ee882dff0b129955efd608a4d5462f38dd8e568b8e40030d1' 
  AND token = 'WS9E0NTQuBHquIEASgMQt1ybI2Gg4MYoSx7u0Ma8wZ0=' 
  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