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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef8f360d881cd63507447aed529c70163867e66fc8d97d523e8660e0b9ea652' 
  AND token = 'UKWetjuUFmud6ZJmeWGfGVkUJyH58nopP5vbgyWx11E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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