SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555b9d22e23520ceda365984b0815a8ea39446fb8170bc047e78d0b4778ba9ec' 
  AND token = '+VomV3qAh4OOQNIgxU8LkeNK+l6z4LGyrf31amtPI5A=' 
  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