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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9207f54f7d4d0fadbfc1e9966905e2a1a56f2ab33c1fbcaef90dd4ab20c6daff' 
  AND token = 'rlx5Tri0XJcUtJOfOhRAmD4EHdL3iygdDfSbnPaf8ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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