SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adcbefb83eb0ca49c3c3b5bbb3815616bb4157b66ebb78d5a428348edf10959' 
  AND token = 'kOz6vm2u2qRCBnj+k7vVFGNpCBh38ZnvZDn2+uQfmeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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