SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb827ce87483988a8ec5567097223165eaa18bae2060b7fa3d4513c02ecfe1a8' 
  AND token = 'XoSnY19P8jN+LcS6tU2E3dEj9/09TyhKpyaBZQpeRqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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