SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5260771f0fdb425b61b88d251a828b60810e7c706e5f7a41b0d47f87dc91b9' 
  AND token = '+ToR8TGI/zWwqpz15Dw5PTih4LQonwa9ImHS03j9Zis=' 
  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