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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f27c44122271beacede87e51bbc6d963422606f76fed9304bad213bfd85e3c' 
  AND token = '2I1rmT3Jkzs97fvFm7AVMbWVk2tjtobkHi3jJs9v6aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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