SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329bfb14dcd62da9601da8c1d827536f37f6f8ba937b4188e557c293047b5a99' 
  AND token = 'm/HJn2vFHqqX1xVgoRwmcXzvPrw6lIS6ho0nA50A1LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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