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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8411469d47fc3b1c8098db2d85fda5d4f26e278e236a9bf121d58fbad54687ee' 
  AND token = '72OCrTt8AJgId7GlXzgWQn4YbvAb997CqEPYaaYbTdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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