SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde2192ef09887aac0355a86c43d933ffddbc0628632014ce987bd0809112001' 
  AND token = '7xmSGykH/bNal/tNyG8IS5kTrcb0BB0T+v1T2AKfdTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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