SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba4cf93c067ac504b0443189ea4a24f7228d14267e37700cdaf52e868a44cf0' 
  AND token = 'lkSgiZommG9uhDqJaTxgJcrzw5BQXwyfmvYsgyOikrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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