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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb92bbc12ca5d51b7f8618784a3a4cba120571699b33ab2799190c13206f9ec5' 
  AND token = 'L0c5DShJW2Rhin2yezNFlNzmHKGGqyZTPvwQALu1Zi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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