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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5722e1b71517969fe2fbc8d920d1d0ba863c1d5cd0999d233588e167f200532c' 
  AND token = 'm8OnHIQUSL4siuUCq97IQQBRxTmJCKw24bJh7qdvn7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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