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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dcb3d2f4e052d7b77835b2452ceea2f265d3b49924082cbac51a57f22e3d39' 
  AND token = 'X6ZrdIVMqSblKznO5N4DnVAuX8FMRbD7f04R8P4by/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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