SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad3a585e29cd621413e812dadac326c105a350289f91e4b4b78b6cdeaf46dff' 
  AND token = 'hnB3cZIvy27PT7oZ0FDYhPWGq2/z5rNDK2EM5xuAmAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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