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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6b481cad3a27a9f30a549666a40614c6f94b12302e3f566cba6ae32ee090dd' 
  AND token = 'ZBncwqomhIuRCd3Iw5+uwhiEQwjDPs4x0PIYJa6EVW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

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