SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5860a9e035ddf8d6ed158a5f5f9b64bd3e76219471b84a6421485141cd7cb33c' 
  AND token = 'SwcviFQwgvdN/TF3CHyjVL8z78M8bJpK3OlHGLpgjT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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