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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0499b623093f4012847ec2c4e6b92cfc8a43912bae7ac01f2694d2cd47766ede' 
  AND token = 'hn9opxHVxBRKJJg6zHJYlbdQteqUdQeGFFuDrW7N4Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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