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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1983abe86992612accc037c20847d76430602a19cafd8db834b96d08ff93e0cf' 
  AND token = 'OOb/H0P3sus8hVxtJmOJ3p/M15pHb1fq+qaD5+WTz4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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