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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405e32622dd8ce03028367a41d0feca379a2962965d2ef46055ace0a879ce8a6' 
  AND token = 'jjLUoPXET9v21aaWSOI4GSoAzCF7Dd8oXzG9XLDM1GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

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