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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262fdb286cbd85305f3de06e66d8b45ab4dfa30cde6e2da4455b18cfbb10d7d0' 
  AND token = '+PB28lKBTozj44t7PKLb0D2ukZiN2GKKgW4ef8uCAnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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