SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7f2b71b972072036c56445d27a5b612c45c4ffead1f07ef6d69af516a63d41' 
  AND token = '3RKpya+NXP+qHcZvFlkcHA/CLr5zUdgB8K3ABoRrGlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}