SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb18ef347b87d3643f46a2e06aa14294e5370179d15efd4a0029f02a789a299' 
  AND token = 'TpKNio/JTO5CyUtF8iCTvTy/2wsgSx9Wiqz/KLi21Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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