SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1028700267852ba893a6be6b37f9ee27b07d14dd0755e7ef847affcceb9afb1f' 
  AND token = 'ONp7TGRPAhLH0/WfvWCQfNpHWdoe7lQyZGFKdUBvQHM=' 
  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