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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8304a72d2832ad33663d1b3e849fa073522db9c67e4c64893a231d6f4c10050' 
  AND token = 'FmlvBO5r2ARa+8lp0rt/GfrPASrWXNwqKKEzRdNpOmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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