SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99cd1e31de8cd2beac2e597b6ac582ab0e47e596ce1dca41a1c329b9c003b3b' 
  AND token = 'mhW3HRxQLMRauEs1BPfJDvWGJ8xINiH+L3xSrWKpVzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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