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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1298ec53ce4303bba2105d14d03e54750a5b250f659d3b1fd9e7c4cb7889e0fd' 
  AND token = 'RHtCREJLT8XbMOaBd+Zt6+GoEfJTwVy1Jur0LyQgW6M=' 
  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