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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d955ee61e7cfcdfb83bd528e356be7d1ed69ab4163b766eaa5c76ce4f3c10d' 
  AND token = '9MhgubntY19G5ytMev56NaSnsVZpCBRORbadhEbCu94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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