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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e8b4dce5bab899ffb39048460495cb9a7239e75735d083211a2aa6c779a110' 
  AND token = '6110n2oLZ2twWoYC9ZDoA0KvbixUSkVdz3dp4hwX5vE=' 
  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