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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5773b79fca10c18ee8c37a63f4caf5d8f6833872cfbd19adc83d939c947369' 
  AND token = 'ZWjLu4Dr2FuVDa9PhR8OMDBM/aKZfj5CrQ3eTdgvhN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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