SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160400924722875bfb7831aecb012814b6656df945ab1530fe91ada58349192d' 
  AND token = 'WSQqgeEGAh6rfoHA2DbEsDzHtf8HhOQfPL3aTET+DnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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