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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a27b57e5695fc359f87c220769c5a4d677a0e5e6963d07c5fcbce425770395' 
  AND token = 'qxVtRdIh3e0otmbk6Pen6MtggsrRwHhKSAsezF2OeA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

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