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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1ce2603e1b0f433c3e0327d4c7e7f6160bf0910d661bbe68bff18f15f33825' 
  AND token = 'wZm2byMaJ8AHtQxgxadwutlV00HUnxujEfvbwCN+5R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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