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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6ec53bbacce85ff135bd4912cc4a8b67ec3f77ac80f2e53b22d397dc0a481a' 
  AND token = 'Ubwr6hiyw4gb0aBnlLH7G3Cu2txt7vtoZujfPvqDRd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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