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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154a09660a00bfd59fa6107a9a4c5901a95ad3d48a7e909123ce5dacb3cb16d8' 
  AND token = '57hps2bP0SOf38oCeOVxwnLRVdIGcYQycz9W4fzSUbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

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