SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6958707ae4a5efcd5dd97410cc051e16cc2785a720bec227362bc3a81b2ae74' 
  AND token = 'F86NP/qfm0djMxaZKu9NU2hy3h9DJWGF/gWtbTbs+n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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