SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c342e660ccdcb961b4de830cc22fef685671968e32dad32e79415f6b03fcb6f6' 
  AND token = 'jA1cn/PJF0x+TuOQe3e4b+7rnFrRxK/+YuCvFemJZRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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