SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2019468d6d2e618bcaf7d32d87d216bb4f3f8c691e7d6147bf39615e7872e019' 
  AND token = 'NMpI8eicIcz3pHt/LQPsV3f2DUICZEUqyLp+6VITUMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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