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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ae15a8526ec2524b8d15c419f32fcfc487dc3af4f2fa2bbacb17906158318a' 
  AND token = 'jVyZ5wxGYdtiThSnkKLZ8CtOtTuwbeTsI4YU5iicGtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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