SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35798a572e4ac98a3558e30598fbc42ad614448aeb3c8312c1c60a60907afa62' 
  AND token = 'fdDdjRETifBwxbDd70D3JVaBkWaeiLO9d217W/yXGB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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