SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c52e1d9334a778af26c546a1409d2f5a11bbe67f300b3999dd58d562473fff' 
  AND token = 'iE0odESFBCsg/k8gOFKe38osAhw0VDyCp7DrqGFq6NE=' 
  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