SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af73419e3b71b8e607108667e6ef5d10e06667504806973ad34ca05d621a3261' 
  AND token = 'sOQEGFyZeZYVo2kA8G0KpFGLlaCsxUJ4M/JzbbSWi+A=' 
  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