SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a659ea507b214d11e0b735a328e1643261ac58a3a5de2d062915508c1a70906' 
  AND token = 'ykyXI99hEva0y/eWmfemvLEbd0Zz+T99ZPWqEtfgrgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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