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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64da64675242581055d44cb500457fee6230e8d10a2dcdbd09c4ac60a3e5a589' 
  AND token = 'AL3ygLll5LUbfFPW9xjOW5IQVYZJyg9udzf2SEjKc94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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