SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b8421f9ae4c73b0cf8b998d960ed19106a4f7ed4c059ea97b53588bdfdc32d' 
  AND token = 'GrVIlpFFxTGzrzjknSiiq/QLBCNtOVHQugrv1iCBoaw=' 
  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