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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48613c327494046a343a583446573540a9cb4791c21c4ae52eb3fb0e2e8de4e8' 
  AND token = 'cOOcOb2hof5i3pah8zU1Wv5uWydONZtcwAOUN4GcQqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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