SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59093ceb4d5b5d1ebcf47ced995bd90ce41dc2a7f787bdeb98ea04f6efb5c385' 
  AND token = 'kItcp4KvWS28nJ+fRrLyx/vsLBEXyci61mKKDbfJ4Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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