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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148c5222d453cf1af578fdb30d25034c068880633a34a575337d04c284ca990e' 
  AND token = '/BBg9u2ixIc1j63ic8jZl7PMS9l0Qs3vJ4NLLmarYys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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