SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb600c1afb15004117a80a70b4854165ff22a90eaf7149f9f46cbea54e170737' 
  AND token = 'rFDLb+QJCJk750QWR4lQQsZUheHbz12pG/4IRl2Yj5E=' 
  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