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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2297745b2ffe55b78a5e97fdc7c264845ba935974cb2526ac2c5805d9a1aa4' 
  AND token = 'oo4OpTdG5sN31kZ8JNgPKXmSK8sXq6jGdFPginyIdQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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