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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bb63a075cb51b87b1d63aec15406e49fe73064dd733d2e83095d39631d440e' 
  AND token = '+HvHkvxtph1X7ir4sMrVzyZTLKvNDOJxTejobLFL7gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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