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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bdd01b10c8e3621646ac598cf80a9ab2f6ad824b91a993160f187256cf79d3' 
  AND token = 'UXMEMbgUZUfG5ah8HAUg0iMbbtcYgrL/AZumUjvjEbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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