SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914fd0952ac549fa173baf108d58cd3dc41b9679248365a902ef841062dd2cab' 
  AND token = 'BIjOuu+id27PW2sPavStPH5yBzFKH+jPsuY1lqV69D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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