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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b3a458ce952f9419b58c6269790b31de0cb66d437007e9681e7840c3fa3b1b' 
  AND token = 'VU2ZlZOpI2y3ISaZyA1JrHqWGIhnaOnwaiVmhZMEQxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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