SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd574cf8b9c45f7951c89f8666d644b5447b434a314865e4d3f535f5555dd62' 
  AND token = 'T/z6EeEqB+WdCnaQvKWJkZVGNVYPeHY1U0/wx/264Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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