SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bed64628362182f6abac4a9d1d5d2fcb4dbb4f7d775ec6c5da64cec1f7bff8' 
  AND token = 'BZughHh8jvPusXsX3p+KhSuCKL8gbv7SzmKqFViMe9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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