SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4bf3c9700770f68018b8dd5df326a51b0f2b704e46edbbd1bf79c74fe60ee3' 
  AND token = '/r7hRUaA4jdcz3deMt1wss131M+5nkwuU824pM78UrM=' 
  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