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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06856d50b56bff5f511baff81f5a99139b6cc06b56f5b0db96a278b14833657' 
  AND token = 'Jeof6aaYRt5RBIv5vL6BYSiANSX8xLzgkTRl7UMEDWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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