SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b564ac179c9a6593ec6b8b7b7fb3a27d66f2e7ce4c4f630dc715db9445c4c84' 
  AND token = '9sZ+fVEWdpjNO//4Gh4p0rhzvDhB6IrIKx0r125zt2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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