SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2528a7ff380247e399e9c1696bcab83dc2de7b4c33896d255c23a0559e6dc8f0' 
  AND token = 'fve1+NTa0frQ/oZlSQUJ2YyYPbwdCeMH24TBjb+uWmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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