SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead72c67f0515e95687c76f0f7a81f0f4c4310cef9ffb75c75d4d7e40d973c40' 
  AND token = 'FrE1YQNumLsCb9W/Qv0OWYu/QRt2sAbU0DcT84EroMU=' 
  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