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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9df8e3d2c342587b7179cd85ea0d276536e7578d45c2b6658e2c3596e5d151d' 
  AND token = 'bPRU8TEyFtY3eYUynxSbv8B6fBLCO6BaKO/lj6EBw9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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