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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c89b930a321e942a9380c21f96dd0aa224c4643c312b88ec554272626ab43db' 
  AND token = 'AfHt+eG/VON6bLlV7Wk9SPCKdLCudeKwmGQ1CNh8pWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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